Will be replaced with GlSkeletonLoader, but for not this just
indicates that GlSkeletonLoading is deprecated

This replaces all the usages of ~/vue_shared/components/icon.vue with
the corresponding GitLab UI component for all remaining ee/ components.

In a previous MR [0] we already replaced the internal implementation
with the GitLab UI component. This should allow us to migrate all usages
without any test failures relating to the differences in their
implementation.

The actual deletion of the file will be done in a follow-up in case we
have missed an instance or someone introduces a new one in the
meanwhile.

[0]: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/38778

The GlDropdown component has been deprecated in favor of
GlNewDropdown. During this transition GlDropdown has been
renamed to GlDeprecatedDropdown. This rename effects
GlDropdownItem, GlDropdownHeader, and GlDropdownDivider
as well.

non-ultimate licenses do not receive free guest users.

Displays all licenses on the admin license
page.
Allows for downloading and delete previous
licenses.